2015 Buick Enclave Owner Manual - Page 253

9-52 Driving and Operating Safety Chains Always attach chains between the vehicle and the trailer. Cross the safety chains under the tongue of the trailer to help prevent the tongue from contacting the road if it becomes separated from the hitch. Always leave just enough slack so the rig can turn. Never allow safety chains to drag on the ground. Weight-Distributing Hitches and Weight Carrying Hitches Trailer Wiring Harness Basic Trailer Wiring The trailer wiring harness, with a seven-pin connector, is located at the rear of the vehicle and is tied to the vehicle's frame. The harness connector can be plugged into a seven-pin universal heavy-duty trailer connector available through your dealer. The seven-wire harness contains the following trailer circuits: . . Trailer Brakes A loaded trailer that weighs more than 450 kg (1,000 lbs) needs to have its own brake system that is adequate for the weight of the trailer. Be sure to read and follow the instructions for the trailer brakes so they are installed, adjusted, and maintained properly. Because the vehicle has antilock brakes, do not try to tap into the vehicle's hydraulic brake system. If you do, both brake systems will not work well, or at all. Yellow: Left Stop/Turn Signal Dark Green: Right Stop/Turn Signal Brown: Taillamps Black: Ground Light Green: Back-up Lamps Red/Black: Battery Feed Dark Blue: Trailer Brake* 1. Body-to-Ground Distance 2. Front of Vehicle When using a weight-distributing hitch, the hitch must be adjusted so that the distance (1) remains the same both before and after coupling the trailer to the tow vehicle. ...